Homogeneous nucleation of a homologous series of n-alkanes (CiH2i+2, i=7–10) in a supersonic nozzle

摘要: Homogeneous nucleation rates of the n-alkanes (CiH2i+2; i=7–10) were determined by combining information from pressure trace measurements and small angle x-ray scattering (SAXS) experiments in a supersonic Laval nozzle. The condensible vapor pJ max, temperature TJ max, characteristic time ΔtJ max, supersaturation SJ max corresponding to peak rate Jmax during measurements. These also served as basis for subsequent SAXS experiments. Fitting radially averaged spectrum yielded mean droplet radius ⟨r⟩, 5<⟨r⟩/nm<31, width aerosol size distribution σ, 2<σ/nm<6, particle number density N, 7×1010